Hydromechanical motor



Jan. 11, 1938. H. F. M MlLLlN HYDROMEGHANICAL MOTOR Filed June 1, 1935IIEB/ J'rwwlw HOWARD F- MHC MILLIN,

Patented Jan. 11,

PATENT OFFICE mnoivmonANroAL Moron Howard F. MacMillin, Mount Gilead,Ohio, as-

signor, by mesne assignments, to The Hydraulic- Press Corporation, Inc.,Wilmington, Del., a

corporation of Delaware Application June 1, 1933, Serial No. 673,872

3 Claims.

This invention relates to hydro-mechanical motors, and in particular, todevices for guiding and retracting the plungersof such motors- Oneobject of this invention is to provide a.

5 hydro-mechanical motor operable in one-direction to advance a platenor ram, and retractable in the opposite direction byymechanismconsisting of a tie member urged along guide members byv means of thecoil springs, or similar yielding means, and including a flexibleelementpassing over pulleys in the tie member.

Another object is to provide a hydro-mechfinical motor, as described inthe preceding'pararaph, wherein the tie member is, provided with anaperture through which vthe motor cylinder loosely passes, therebyenabling the motor cylinder to serve as an additional guide memberduring the reciprocation of the tie member. QIn the drawing: I

Figure 1 is a side elevation of the hydro-mechanical motor andretraction mechanism of this invention. i

Figure 2 is a vertical section along-the line 22in Figure 3. v

chanical motor shown in Figure 1.

Referring to the drawing in detail,- 2 and 3 show the hydro-mechanicalmotor of this invention as consisting of a housing 33 containing ahollow ram chamber 3i, to which accessis obtained by way of the coverplate 32. The latter is opened by releasing the latch 33,

and swings upward on its hinge 34 (Figure 2).

Reciprocably mounted within the ram. chamber 35 36 as by the set screw31 in a hollow socket 38. The piston rod 35 passes through a stumng box39-, having a packing 40 adaptedto prevent the passage of liquid out ofthe ram chamber 3!. Beyond the stufling box 39 the piston rod 35 passesthrough a drainage chamber 4! with a drainage conduit 42 leading back tothe fluid tank, or other source from which the workingfluid is obtained.The piston rod 33 then passes through a bore 43 and enters a cylinderchamber 44, situateii in the interior of a hydraulic cylinder 45.

" 1 I The drainage chamber 4| and the conduitv 42 are tion, fluidpressure is admitted to the cylinder chamber 44 through the coupling 41and the Figure 3 is a top plan view of the'hydro-me- Figures M isa-movable ram 35, attached to a, piston rod.

conduit 43. The fluid pressure admitted through the'above connectionsforces the piston 46 downwardly and forwardly, pushing the ram 35forward along its chamber Si by means of the piston {rod 36 attachedthereto. Any fluid escap- 5 ing by the piston 46, or otherwise enteringthe left-hand end of the cylinder chamber 44, is returned to the tankthrough the conduit 49.

' The pressure fluid forces the piston 46 solely in a forward direction.To retrieve the piston 10 46 and the ram 35 connected to it by thepisfton rod36," retrieving means are arranged as shown in Figures 1, 2and 3. Secured in the end plate 52 of the ram chamber 3! are a pair ofguide rods 53, around each of which a helical 15 compression spring 54is coiled. Arranged to -slide to and fro on the guide rods 53 is a plate55, through the holes 56 of which the guide rods 53 loosely pass. Thesliding plate 55 likewise contains a. pair of rectangular slots 51, inwhich are arranged rotatable pulleys 58, around each of which passes achain 59. One end of each chain 59 is secured to a hook 6!], anchored inthe end plate 52 of the ram chamber 3|, whereas the opposite end of eachchain is secured to 5 the movable ram 35by another hook (it anchoredtherein and passing through an aperture 62 in the end plate 52.

In operation, when the ram 35 is forced for- ,ward through theaction ofthe pressure fluid upon thepiston 46, it' pulls the chains 59 with it,causing the sliding plate 55 to move downward upon the guide rods 53,compressing the helical spring 54. When the fluid pressure is releasedthe energy stored up in the helical springs 54 forces the sliding plate55 backward, causing the chains 59 to pull the ram 35 back to itsstarting position. .When the piston 46 and the ram 35, connected to it,have been forced downwardato their extreme forward position, the piston46 uncovers the port 63, thereby permitting the pressure fluid to rushoutward through the conduit 34 to any other hydraulic apparatus whichmay be desired under certain circumstances to operate in sequence withthe previously described apparatus, and forming no part of the presentinvention.

It will be understood that I desire to comprehend within'm'y inventionsuch modificationsv as may benecessary to adapt it to varying conditionsanduses.

Having thus fully described my invention, what I claim as new and desireto secure by'Letters inder thereon, a plunger-therein, a platen on saidplunger, guide members amnged on opposite sides of said plunger, a tiemember mounted for reciprocation along said guide members and having anaperture substantially surrounding the outer surface of said cylinder inrelatively slidable relationship therewith whereby the cylinder. is Iadapted to assist the guide members in retaining"- the tie member in itsproper position and pathrot motion, a flexible member secured at one endto sa'idmlaten and passing'movably over said tie member to an anchorageat the opposite end of said flexible member, and yielding means ar--ranged to urge said tie member in a direction adapted to oppose theworking stroke of said "plunger.-

2. In combination, a frame, a hydraulic cylinder thereon, a plungertherein, a platen on said plunger, guide members arranged on oppositesides 01 said plunger, a tie member mounted for reciprocation along saidguide members and having an aperture substantially surrounding the outersurface of said cylinder in relatively slidable relationship therewithwhereby the cylinder I is adapted toassist the guide'members inretaining the tie member in its proper position and path of motion, aflexible member secured at one end to said platen and passing movablyover said tie member to an anchorage at the opposite end of saidflexible member, and yielding means arranged to urge said tie member ina direction adapted to oppose the working stroke of said plunger, saidguide members including a pair of rods arranged substantially parallelwith the axis of reciprocation of said plunger whereby to cause the tiemember, plunger and guide members to occupy the minimum space.

3. In combination; a frame, a hydraulic cylinder thereon, a plungertherein, a platen on said plunger, guide members arranged on opposite.sides of said plunger, a tie member mounted for to anchorages at theiropposite ends, and yield-- ing means arranged to urge said tie member ina direction adapted to oppose the working stroke 01 said plunger.

HOWARD F. MicmLLm."

